[FIR] Change scheme of generating declarations by plugins

Methods `needToGenerateAdditionalMembersInClass` and
  `needToGenerateNestedClassifiersInClass` are removed, now compiler
  uses `get...Names` and `getTopLevel...` methods to determine which
  extension may generate declaration with specific classId/callableId

This is needed to simplify API of FirDeclarationGenerationExtension and
  provide guarantee that `generate...` method will be called with
  specific classId/callableId only if specific extensions returned name
  for this id from `getName...` functions

compiler/fir/tree/src/org/jetbrains/kotlin/fir/extensions/FirExtension.kt

@@ -45,3 +45,6 @@ abstract class FirDeclarationPredicateRegistrar {
     abstract fun register(vararg predicates: DeclarationPredicate)
     abstract fun register(predicates: Collection<DeclarationPredicate>)
 }
+
+@RequiresOptIn
+annotation class FirExtensionApiInternals

compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirFunctionSymbol.kt

@@ -12,9 +12,7 @@ import org.jetbrains.kotlin.fir.expressions.FirDelegatedConstructorCall
 import org.jetbrains.kotlin.fir.references.FirControlFlowGraphReference
 import org.jetbrains.kotlin.fir.references.FirResolvedNamedReference
 import org.jetbrains.kotlin.fir.symbols.ensureResolved
-import org.jetbrains.kotlin.name.CallableId
-import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.name.*
 
 sealed class FirFunctionSymbol<D : FirFunction>(
     override val callableId: CallableId
@@ -57,6 +55,8 @@ class FirIntersectionOverrideFunctionSymbol(
 class FirConstructorSymbol(
     callableId: CallableId
 ) : FirFunctionSymbol<FirConstructor>(callableId) {
+    constructor(classId: ClassId) : this(classId.callableIdForConstructor())
+
     val isPrimary: Boolean
         get() = fir.isPrimary